9. Mata Hari: The Most Notorious Spy of World War I
Mata Hari, born Margaretha Geertruida Zelle in 1876, was a Dutch exotic dancer and courtesan who became infamous during World War I. In 1916, she was recruited by French intelligence to spy for France. However, she was arrested in 1917, accused of being a double agent for Germany, and executed by firing squad on October 15, 1917. Her story remains a cautionary tale of espionage and intrigue. (biography.com)
